×

Multiple data surface data storage system and method

  • US 5,487,060 A
  • Filed: 12/06/1993
  • Issued: 01/23/1996
  • Est. Priority Date: 06/04/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. An optical data storage system comprising:

  • a laser;

    an optical medium having a plurality of data surfaces separated by light transmissive elements;

    an optical transmission device, including an adjustable focus device, for focusing a light beam from the laser to one of the data surfaces of the medium;

    a control device connected to the focus device for controlling the focus device to focus the light beam to one of the data surfaces; and

    an optical reception device for receiving the light beam after it is reflected from the optical medium and providing a data signal responsive thereto, the optical reception device having a collimation device for collimating the light beam reflected from the data surface to which the light beam was focussed, and passing as noncollimated light the light that was reflected from the other data surfaces, and a filter for passing said collimated reflected light and rejecting said noncollimated light, wherein the filter comprises a focus lens for focusing said collimated light to a focal spot, a first light blocking member located in a plane of said focal spot and having an aperture at said focal spot, a second light blocking member located between the focus lens and the first blocking member, the second blocking member having a pair of parallel slits for allowing light to pass, and a collimating lens for collimating the light passing through said aperture of the first blocking member.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×